package unit3;

public class DemoVar5 {
    int v1;

    void f1() {
        int v2 = 20;
        System.out.println(v1 + v2);
    }

    public static void main(String[] args) {
        DemoVar5 var = new DemoVar5();
//        var.v1 = 10;
        var.f1();
    }
}
